Siemens SINAMICS S120 Function Manual page 242

Vector control
5.17 Flying restart
The settings for fast flying restart can be made in the expert list.
1. To switch flying restart to "fast flying restart", make the following setting: "p1780.11 = 1".
The normal flying restart had the parameter setting "p1780.11 = 0". For operation with
encoder, settings of this bit are ignored because fast flying restart is not possible in this
case.
2. Activate the fast flying restart as with the normal flying restart via parameter p1200.
3. Perform a standstill measurement (p1900 = 2) for the correct parameterization of the
voltage model for both vector and V/f mode to determine the power resistance.
The critical parameters are the stator resistance (p0350) and the stator leakage
inductance (p0356).
The following status bits indicate the characteristic of the flying restart:
– For V/f control: r1204.14.
– For vector control: r1205.16 or r1205.17.
Note
Parameter p1203 has no effect on the fast flying restart. Parameter p1202 (flying restart
detection current) can be used to tune the fast flying restart.
Note
Detection current must not become too small
If the drive is operated well into the field weakening or with filters or long cables, the
detection current may become too small with the fast flying restart (F07330).
In this case, set the detection current (p1202) to values > 30%.
Fast flying restart with voltage acquisition
The time for the connection to a rotating induction motor can be shortened when the terminal
voltage of the motor is measured. This requires that a VSM module is connected (see
Voltage Sensing Module (Page 246)).
1. Select the voltage measurement for the fast flying restart: p0247.5 = 1.
2. Activate the flying restart: p1200 > 0.
The following status bits indicate the characteristic of the flying restart:
– For V/f control: r1204.15
– For vector control: r1205.18, r1205.19, r1205.20
Note
If the measured voltage amplitude undershoots the 1% limit of the converter rated voltage,
the flying restart with voltage measurement is deactivated and the rotating frequency sought.
242
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions